To discuss the existence and topological features of edge states in
AB-stacked BLG ribbon, we first give a brief review of the edge states in
the MLG ribbon. In general, MLG tight-binding Hamiltonian with nearest
neighbor (NN) hopping energy \(t\)  and on-site potential \(U_{i}\)  can be
written as [1]}
\(H=-t\sum _{\left\langle i,j\right\rangle }c_{i}^{\dagger }c_{j}+\sum _{i}U_{i}c_{i}^{\dagger }c_{i},\) 
